\Ac`ti*no*my*co"sis\, n. [NL.] (Med.)
A chronic infectious disease of cattle and man due to the
presence of {Actinomyces bovis}. It causes local suppurating
tumors, esp. about the jaw. Called also {lumpy jaw} or {big
jaw}. -- {Ac`ti*no*my*cot"ic}, a.